The rate limiting enzyme in the synthesis of catecholamines is:
A. Tyrosine hydroxylase
B. Dopa decarboxylase
C. Dopamine β-hydroxylase
D. Noradrenaline N-methyl transferase
A. Tyrosine hydroxylase
B. Dopa decarboxylase
C. Dopamine β-hydroxylase
D. Noradrenaline N-methyl transferase